Apply default cascade rules for firebird self-ref ForeignKeys.
Apply default cascade rules for firebird self-ref ForeignKeys.

WinterNis/sqlalchemy,halfcrazy/sqlalchemy,alex/sqlalchemy,robin900/sqlalchemy,elelianghh/sqlalchemy,epa/sqlalchemy,j5int/sqlalchemy,graingert/sqlalchemy,Cito/sqlalchemy,WinterNis/sqlalchemy,brianv0/sqlalchemy,zzzeek/sqlalchemy,sqlalchemy/sqlalchemy,bdupharm/sqlalchemy,sandan/sqlalchemy,wfxiang08/sqlalchemy,sandan/sqlalchemy,bdupharm/sqlalchemy,inspirehep/sqlalchemy,bootandy/sqlalchemy,Akrog/sqlalchemy,inspirehep/sqlalchemy,276361270/sqlalchemy,olemis/sqlalchemy,robin900/sqlalchemy,dstufft/sqlalchemy,bootandy/sqlalchemy,pdufour/sqlalchemy,monetate/sqlalchemy,halfcrazy/sqlalchemy,j5int/sqlalchemy,alex/sqlalchemy,olemis/sqlalchemy,wfxiang08/sqlalchemy,Akrog/sqlalchemy,EvaSDK/sqlalchemy,davidfraser/sqlalchemy,dstufft/sqlalchemy,graingert/sqlalchemy,alex/sqlalchemy,wujuguang/sqlalchemy,wujuguang/sqlalchemy,davidjb/sqlalchemy,hsum/sqlalchemy,monetate/sqlalchemy,davidjb/sqlalchemy,elelianghh/sqlalchemy,ThiefMaster/sqlalchemy,Cito/sqlalchemy,hsum/sqlalchemy,pdufour/sqlalchemy,itkovian/sqlalchemy,brianv0/sqlalchemy,davidfraser/sqlalchemy,epa/sqlalchemy,276361270/sqlalchemy,EvaSDK/sqlalchemy,Cito/sqlalchemy,ThiefMaster/sqlalchemy,itkovian/sqlalchemy